Turbine nozzle-valve.



No. 856.206.- PATENTBD JUNE 11, 1907. G. A. BAGKSTROM.

TURBINE NOZZLE VALVE. APPLICATION FILED 00m. 1904. RENEWED APR. 22, 1907.

INvVE N TOR A ha,"

A TTDRNEYJ "onrrnn STATES PATENT orrron.

CHARLES A. BACKSTROM, OF MILWAUKEE, VVISOONSIN, ASSIGNOR TO BACK- STROM-SMITII STEAM TURBINE & MANUFACTURING COMPANY, A COR- PORATION OF WISCONSIN.

TURBINE NOZZLE-:VALVE.

Specification of Letters Patent.

Patented June 11, 1907.

Application filed October 3, 1904. Renewed April 22, 1907. Serial No. 369,573.

T (1/7/7 whom, it may concern:

Be it known that I, CHARLES A. BACK- STROM, a citizen of the United States, residing at Milwaukee, county of Milwaukee, and State of I/Visconsin, have invented new and useful Improvements in Turbine Nozzle- Valves, of which the following is a specification.

My invention relates to improvements in turbine nozzle valves.

The object of my invention is to provide a form of valve which will offer a minimum resistance to the valve actuating devices and which will close perfectly and be held to its seat by the pressure of the motive fluid.

In the following description, reference is had to the accompanying drawings in which,

Figure 1 is a transverse sectional view of a turbine embodying my invention and showing a nozzle partition partially broken away to expose a portion of a running wheel. Fig. 2- is a detail view of the same in axial section. Fig. 3 is a detail view showing a portion of the controlling lever and band valve in section drawn to a plane of the nozzles and band valve. Fig. 4. is a detail plan view of the outer end of the controlling lever and a portion of the band valve.

Like parts are identified by the same refer ence characters throughout the several views.

1 is a turbine casing; 2, a running wheel provided with vanes 3, and 4 is a nozzle par tition having a nozzle ring concentric with the vanes and arranged for an inward flow of the motive fluid to the vanes through suitable nozzles 5.

Controlling levers 6 are pivotally secured to the nozzle partition at 7 and off-set at their outer ends 8 over the nozzle ring, the latter having an outer surface curved outwardly in an arc concentric with that in which the portion 8 of the lever swings. The nozzles are formed in groups, one group being located in each of these outwardly curved or bulging portions of the nozzle ring. band 9 of flexible material is secured at one end 10 to the nozzle ring at one side of the group of nozzles, and extends from that point of connection through a slotted or forked guide arm 11 connected with the controlling lever. The other'end of the band is preferably looped inwardly and also secured to the nozzle ring at 12 near the opposite end of the group of nozzles from that at which the end 10 is secured. The band passes angularly through the guide arm 11 in such a manner as to rest flat on the bulging portion of the nozzle ring between the guide and the end 10 where it is secured to the ring, thus closing the nozzles which it covers. An increasing number of nozzles is therefore covered as the lever swings away from the end 10 of the.

band and uncovered as the lever swings toward that end.

The levers are actuated by a rod 15 which extends through a suitable stuffing box at 16 and has its interior end connected with one of the levers by a link 17. The levers are connected with each other by a link 18, two levers being illustrated in Fig. 1. It will be understood, however, that any desired number of levers and valves may be employed, or, if desired, other means may be employed for actuating the valves without departing from the scope of my invention.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is,-

1. In a turbine, the combination of a nozzle partition provided with apertures, each arranged to constitute an independent nozzle adapted for a separate delivery of motive fluid to the movable member of the turbine; flexible material adapted to cover and close the nozzle apertures; and means for progressively bending the flexible material outwardly from the partition to successively uncover said apertures.

2. In a turbine, the combination of a nozzle partition provided with nozzle apertures; flexible material adapted to cover and close said apertures; a movable device for bending said flexible material toward and away from' the partition; and means for maintaining a uniformly varying relation between said device and the nozzle apertures.

3. In a turbine, the combination of a nozzle partition provided with nozzle apertures; flexible material adapted to cover and close said apertures; a movable device for bending said flexible material outwardly and away from the nozzle partition to successively uncover said apertures; a swinging connection pivotally secured to said device and to a fixed point of support; and means for actuating said device; said nozzle apertures being grouped in an arc corresponding substantially with that described by the outer end portion of the swing connection.

4. In a turbine, the combination of a nozzle partition provided with nozzle apertures arranged in groups; a strip of flexible material secured to the partition adjacent to the nozzles of each group and extended over the nozzle apertures in a position to close the same; and means for progressively bending the strip away from the partition.

5. In a turbine, the combination of a nozzle partition provided with a group of nozzle apertures comprising a strip of flexible material extended across said apertures, with one end secured to the partition, and the other end looped inwardly beyond the nozzles and secured to the partition in reversed position; and means for progressively adjusting the intermediate portion of said strip to and from the apertured portion of the partition to successively open or close said nozzle apertures.

6. In a turbine, the combination of a nozzle partition provided with an off set apertured portion constituting a nozzle ring; a strip of flexible material secured to the nozzle ring and extended over nozzle apertures therein; a lever pivotally connected with a suitable support and provided with a guide loosely engaging said strip, the inner portion of said guide being arranged in close prox: imity to the nozzle ring extending therefrom outwardly; and means for swingin said lever; the outer surface of said nozz e ring being curved in correspondence with the are described by said uide.

In testimony w ereof I afiix my signature in the presence of two witnesses.

CHARLES A, BACKSTROM. Witnesses:

JAs. B. ERWIN, O. R. ERWIN. 

